Construction material



CONSTRUCTION MATERIAL Filed Jan. 25, 1950 v IN VEN TOR.

Patented Oct. 31, 1933 CONSTRUCTION MATERIAL Ralph A. Altenhof, BethelTownship, Allegheny County, Pa., assignor to The Koppers Company ofDelaware, a corporation of Delaware Application vJanuary 25, ,1930.Serial No. 423,406 2 claims. (ol. 91-68) This invention relates toconstruction matetreated tar such as thatdescribed in a copending rialsand more particularly to Waterproof, stone application Serial No.434,811, filed Mar. 10, 1930. or stone-like materials and to processesof pre- Sulphur treated water gas tar, oil gas tar or coke paring thesame. oven tar have excellent penetrating qualities and 5 Considerabledifficulty is experienced in preare extremely resistant to the effectsof Water. 60

venting moisture or Water from passing through The tar to be treated isfirst dehydrated and stone or similar materials used for constructionthen heated with about 5% or more by weight purposes. In theconstruction of buildings, of powdered sulphur. The heating is continuedWhere certain portions of the Walls are necesso long as substantialamounts of hydrogen sulsarily thin, moisture often finds its Way throughphide are evolved. The treated tar is then ready 65 the pores in thestone. In cellars as Well as in to be mixed with the metallic powder inthe tunnels there is danger of seepage Which causes proportion of abouttwo pounds per gallon of erosion and produces unsightly stains. Toovertar. come these difficulties, certain Waterproong As stated in theabove application, other maagents have been employed, but satisfactoryreterials such as resins, gums, bituments such as 70 sults have notalways been obtained. gilsonite', and materials usually added to paintsThe present invention provides a means wheremay be added to the tar. bysuch materials as stone, concrete, cement, Porous stone material aftertreatment with the brick, and other porous ceramic materials, are abovewaterproofing agent has on its outer Surrendered impervious to water ormoisture or even face a continuous film of metal formed by over- 75 toair. This is accomplished by sealing the surlappingl flakes `which coverthe pores. The biface of the material with a relatively Athin filmtuminous matter fills the pores for a substantial of metal. To producethis film, finely divided distance inwardly. Enough of the bitumenremetal, such as alminurn, aluminum bronze or copmains at the surface tohold the metal flakes in per bronze, preferably in flake form, issuspended position. Sulphur treated tars are particularly '80 in aliquid medium containing bituminous matter. suitable in this case inthat they have excellent This mixture is applied to the stone orstone-like adhesive properties and only a small amount is materials byspraying or by brushing. Blocks of necessary to cause the metallicflakes to adhere the latter materials may also be dipped in the firmlyto the stone. Furthermore, these tars mixture. Will not bleed throughthe metal film. 85

When the above mixture is applied to the sur- Sulphur treated tars arecomparatively free face of concrete or brick or other material of fromsolid particles and permit rapid leang and like nature, the metal,particularly When it is in the formation of a perfectly continuous lm offlaked form, immediately forms a continuous film the metal flakes onstone materials. The flakes on the surface of the concrete or othermaterial. are not affected by the sulphur treated tars due 90 This lm 0fmetal DTBVGIIS any Substantial evapto the fact that these tars arepractically free oration of the liquid medium and causes the latfromacid. ter to take the other course, namely, to penetrate While I havedescribed sulphur treated tar or impregnate the concrete or othermaterial. `A as the preferred waterproofing material and vepracticallyperfect seal is thereby formed. hicle for the metal powder, it isconceivable that 95 In the accompanying drawing, Figure 1 showsa certainother forms of tar and asphalt may be section through a concrete block,one surface of employed without materially impairing the charwhich iscoated With the Waterproofing mateacteristics of the process or theproduct of my rial. The outer layer 1, which is lsomewhat exinvention.

aggerated in thickness, represents the metallic When untreated tars andasphalts are em- 100 film. 'Ihe inner layer 2 represents the portionployed, the relative positions of the layer-s illusof the blockimpregnated or saturated with the trated in the drawing aresubstantially the same bitumen. but the advantages of sulphur treatedtars are Fig. 2, which shows a section through' a block more or lesslacking. of stone-like material, illustrates the relative po- It isreadily seen that stone-like materials com- 105 sitions of the metalliclin 3 and the bitumenbined with an outer film of metal andimpregsaturated-layer 4 after the Waterproofing matenated withbituminous material have a number rial has been applied to the entiresurface of the of advantages and are adapted to many uses. block. fBesides being Waterproof they are less 'af The preferred bituminousmaterial is a sulphur -fected by oils. When applied to walls of tunnels110 or of cellars, a practically water-tight seal is obtained, and atthe same time Where aluminum is used a particularly pleasing, brightsurface is obtained which is not subject to stain and that serves toreect light. usually made of concrete, may also be rendered waterproofor more pleasing in appearance by means of the foregoing materials. Theymay also be used on dams and in the bottoms of p ools.

I claim as my invention'.

Grave vaults, which are' l. Construction material comprising' porousstone or stone-like material having in its pores sulphur-treated tar andhaving on its surface a continuous lm of metal. 'j

2. Construction material comprising porous stone or stone-like materialhaving in its vpores sulphur-treated water-gas tar and having on itssurface a continuous film of metal.

RALPH A. ALTENHOF.

